﻿<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>插入简单的换行符,一个空标签，意味着它没有结束标签。所以这样是错误的：<!--<br></br>--></title>
</head>
<body>
    This text contains<br />a line break
</body>
</html>